`5,`
`E(u)=3-2u+5u^2-3u`
`= 5u^2+(-2u-3u)+3`
`= 5u^2-5u+3`
`6,`
`H=3u^2-2u^5+2u^7-3u^2-5`
`= -5+(3u^2-3u^2)-2u^5+2u^7`
`= -5-2u^5+2u^7`
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